Apparatus for calcining and clinkering



Sepfi. 18, 1923.,

R. D. PIKE APPARATUS FOR CALGINING AND cmmmnme Filed July 5. 1922 2 Sheets-Sheet 1 Even d on Sept. 18,1923.

R. D. PIKE APPARATUS FOR CALCINING AND CLINKERING Filed July 5. 1922 2 Sheets-Sheet 2 Fig. 2

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rashes Sept. is, ieaa meant MBERT D. PIKE, OF SAN FRANCISCO, CALIFORNIA.

APPARATUS FOR CALCINING AND CLINKERING.

Application filed July 5,

To all whom it may concern:

Be it known that 1, ROBERT D. PIKE, a .citizen of the United States, residing at the city and county of SanFrancisco and State of California, have invented certain new'and useful Improvements in Apparatus for Calcining and clinkering, of which the following is a specification.

The present invention relates to an apparatus for the carrying out of a continuous process of calcination' and clinkering of carbonate rocks, such as calcite and magnesite,

or other material subject to a similar treatment, the invention relating more specifically to an improvement in the apparatus for calcining and clinkering set forth in my pending application Serial No. 427,466, filed in the United States Patent Oiiice under date of December the 1st, 1920, for the continuous method and apparatus for calcining and clinkering. In my said pending appli cation, the air for supporting combustion in the calcining element of the apparatus is disclosed as passin from the cooling ele ment directly into t e rotary clinkering element of the apparatus, and )IOIII the clinkering member directly into the calcinin element or member of the apparatus, disc arging into said element at substantially the zone of combustion therein. The products of combustion, or the air received into the clinkering element from the cooling element,

and discharging from the clinkering element directly into the calcining element for sup porting combustion therein is rich in oxygen and carries therewith the C0 gas resulting from burning the fuel in the clinkering member, with the result that pure air is not discharged into the calcining member to support combustion. As substantially all of the air for supporting combustion in the calcining member of the apparatus set forth in my said pending application is required to ass through the rotary clinkering member t ereof, of necessity the clinkering member must be of a diameter larger than that re uired for more clinkering purposes. I have ound that if the air passing through the coolin member or element ofthe apparatus be irected mainly to the combustion zone of the calcining member or element of the apparatus, and only a sufiicient quantity of such air be permitted to enter the clinker ing member or element at the point of combustion thereof as will support necessary combustion therein, and the products of 1922. Serial Flo. 572,%95.

combustion from the said clinkering member be delivered to the calcining member at a point beyond the zone of combustion therein, that the.fiame temperature of combustionfor the calcining member will be higher and the thermal efficiency thereof will be greaterby reason of the fact'that the air admitted for combustion does not have intermixed therewith CO gas, and at the same time as only sufficient air is admitted from the cooling member to the clinkering member to support combustion a rotary clinkering member of smaller diameter may be utilized than the clinkering member necessary to be employed in the apparatus set forth and described in my said pending application Serial No. 427,466, and such smaller diameter clinkering member results in more efiicient heat transfer from flame to clinker and in a smaller loss by radiation to the outside.

In order to comprehend the invention, reference should be had to the accompanying sheet of drawings, wherein Figure 1 is a part broken side View in elevation disclosing the assembled apparatus.

Figure 2 is a part broken vertical sectional view taken through the calcining ele ment of the apparatus disclosing" the interior arrangement thereof and the disposition of the annular flue relative to said element for the discharge of the heated air of the.

tary element of the apparatus which is employed for the clinkering of the calcined material delivered thereto as discharged from the calcining element, and 3 designates! the cooling element of the apparatus, which is situated in a plane below the clinkering member 2.

The cooling member 3 receives the hot clinkere'd material discharging from the rotary clinkering element or member 2. In the present case, the member 1 is constructed as a multiple hearth calcining structure for which is fed therein by any suitable form of a feeder 4. The said element 1 is provided with a series of burners 5 for the use of gaseous, liquid or pulverized fuel, wh1ch burners are situated adjacent the lower portion of the element 1 for directing flames onto and over the lower hearth of the said calcining member 1. There is interposed be:

tween the-upper end of the rotary member 2 and the bottom of the member 1 a receptacle 6, which provides a receiving chamber 6' into-which the products of combustion from the member 2 discharge, the said prodnets of combustion escaping or flowing from the chamber 6' through the flues or conduits 7 which communicate with the vertically disposed flues 9 of the calcining member 1; the products of combustion moving upwardly through the flues 9 and escaping therefrom through the outlets 10 into the calcining member 1 and over the hearths therein at points above the zone of combustion of the said member 1. The calcined material discharging from the stationary calcining member 1 moves through the downwardly extended water cooled conduit 11 and discharges therefrom into the upper end of the rotating clinkering member 2. In the lower end of the clinkering member 2 is extended a burner 12 for gaseous, liquid or powdered fuel, the said burner being extended into a firing hood 13 which surrounds the lower end of the member 2, but does not rotate therewith. There is a suitable running joint provided between the said firing hood 13 and the lower end of the rotating clinkering member 2 and the upper end of said member 2 is similarly connected with the receptacle 6 of the chamber 6'. As the calcinedimaterial flows through the rotating member 2 it is subjected to the heat of the flame from the burner 12, and as the path of travel through the chamber 2 is a prolonged one, the material flowing'therethrough is fully clinkered before discharge therefrom. The clinkered material discharging from the lower end of the downwardly inclined rotary clinkering member 2 passes through a downwardly extended flue 14, and is delivered therefrom in the cooling member .3, which member may be of any suitable structure. In my former application Serial No. 427,466 the coolin member is illustrated as a rotary one, whi e in the resent case such member is illustrated of a orm corresponding to that of the calcining member 1. As

the material flows downwardly through the cooling member 3 the same is subjected to a counter-flowing stream of cold air assing therethrough and admitted thereto t rough the nozzle or air inlet 15, the cooled clinkered material dischar g from the cooler 3 through the disc arge spout lfi, provided bustion in the rotary clinkering member is supplied in a preheated form from the cooler 3. There'is also extended from the cooler 3 a conduit 20 provided with a damper-control 21 and with a hopper bottom 21' for collectv ing dust which may be carriedover by the air current from the cooler, the discharge end of the conduit 20 communicating with an aunular flue 22 surrounding the lower end of the calcining element 1. The heated air of the cooler admitted into the said annular flue 22 discharges therefrom through a plurality of fines 23 extended therefrom for conveying the air onto and over. the lower hearth arranged within the calcining element 1 for supporting combustion of the fuel used therein for calcination. In this manner, the air for supporting combustion is delivered as pure air to the zone of combustion of the calcining member 1, and said air is free of the CO gas which is mixed with the products of combustion discharged from the rotary clinkering member 2, and which products of combustion do not enter the calciner or calcining member 1 until after combustion has occurred or takenplace therein. By discharging the products of.

combustion from the rotary--01: clinkering element 2 into the calciningl 'element -1- at' points above the zone of combustion, all heat-of such products of combustion is utilizedin the calcining element without the CO contained therein retardingcombustion in the said element 1. Inasmuch as the heated air for supportin combustion of the 'fuel is'delivered from t e cooling member 3 to the zone of combustionof'the calcining element 1 as pure air, the flame temperature within the calciner will be higher and the.

thermal efficiency therefore greater than if even a small percentage of CO is mixed with the air.

By the invention of the described apparatus for calcinin and clinkering of the des1red material a heat units contained in the an passing through the cooling element of the apparatus are conserved andutilized to support combustion of the fuel employed in connection with the calcining-element and the rotary clinkering element of the 'a paratus, only such portion of said air is elivered as pre-heated pure air to the combustion zone of the calcining-element which memes isrequir ed for supporting combustion of the fuel used therein, while the hot products of combustion from the rotary clinkering element are delivered into the calciner element at points situated above the combustion zone of said element so as not to retard combustion in the calciner by reason-of the CO contained therein. By reason of the invention permitting of the use of a rotary clinkering element of small diameter and which is determined by the amount of gas rather than by the amount of clinker which must be passed, there is not only a more eflicient heat transfer from the flame tothe clinker, but smaller losses by radiation to the outside atmosphere.

It will be understood that the inner wall surface of the rotary clinkering element, of the calcining element and the various fineswhere required, will be lined with suitable refractory material.

The invention resides in utilizing the preheated air discharging from the cooler for the clinkered material to support combustion for the fuel of the clinlnering element and the calcining element, directing a portion of such air'direct to the zone of combustion for the fuel of the clinkering element and another portion thereof aspure heated air to the zone of combustion for the fuel of the calcining element, and delivering the products of combustion from the clinkering element in the calcining element at points above its zone of combustion. I,

The design, shape or construction of the calcining, clinkering and cooling elements is an immaterial feature of the invention, one form of such element being fully illustrated and described in my said pending application Serial No. 427,466. The only change in such constructed elements of said cooler element to the zone of combustion for the fuel of the clinkering element and the I calcining element and for directing the Cal products of combustion from the clinkering element into the calcining element at points above its zone of combustion.

I do not wish to be understoodas limiting or confining the invention to the details of construction herein shown and described, but on the contrary desire'and wish to be understood as =claiming the invention as broadly as the state of the art will warrant.

No claim is made in the present application for the method as my invention, inasmuch as the same will be set forth in an ap lication to be filed hereafter.

aving thus described the invention, what is claimed as new and desired to be protected by Letters Patent is .1. An apparatus for calcining and clinkeringcarbonate material, the same comprismg a calcining element, a clinkering element and a cooling element, means for delivering the calcined material into the clinkering element without exposure to the outside atmosphere, means for delivering the clinkered material within the cooling element, burners associated with the calcining element and a burner associated with the clinkering element, means for leading one portion of the air passing through cooling into the clinkering member for supporting combustion, {and another portion thereof into the calcining element within the zone of combustion therein.

2. An apparatus for the described purpose comprising a calcining element, a clinkering element associated therewith, and acooling member for the clinkered material, a line for delivering a portion of the air passing through the cooler into the clinkering member to support combustion therein and a fiue for delivering another portionv of the air passing throu h the cooler into the calcining element within the zone of combustion therein.

3. An apparatus for the described purpose comprising a calcining element pro vided with a series of upwardly extending fines communicating with the interior thereof at points above the zone of combustion therein, a clinkering element associated with the calcining element and adapted to re ceive therefrom calcined material, means for directing the products of combustion from the clinkering element into the upwardly extending fines of the calcining element, a cooling element associated with the clinkering element for receiving clinkered material discharging therefrom, a fine for directing a portion of the air passing through the cooler into the clinkering element for supporting combustion therein, and means for directing another portion of the air passing through the cooling element into the calcining element within the zone of combustion therein.

4. An apparatus for the described purpose, the same comprising a calcining element provided interiorly with means for the calcination of material passing therethrough, a clinkering element associated therewith means for conveying waste heat and gases discharging from the clinkering element into the calcining element, a cooling element associated with the clinkering element, and means for conveying air from the cooling element and discharging the same into the calcining element within its zone of combustion without prior intermixture with the products of combustion of the clinkering element.

5. An apparatus for the described purpose, the combination with a calcining ele ment provided with a series of upwardly extended flues communicating with the interior thereof above its zone of combustion, 1

. the clinkering element for receiving clinker.-

ed material therefrom, and means for conveying air from the cooling element and discharging the same into the calcining element within its zone of combustion without,

prior intermixture with the products of combustion of the clinkering element.

6. An apparatus for the described purpose, the same comprising a calcining ele- J ment provided with upwardly extended ,flues communicating with the interior thereof at points above its zone of combustion,

a. clinkering element, means for conveying the products of combustion therefrom into .the upwardly extending flues of the cal cining element, an annular flue interposed between the clinkeringelement and the calcining element provided with a series of outlets communicating with the interior 05 the calcining element withinlthe sphere of its zone of combustion, 'a. cooling element" associated with the clinkering element, and means for conveying air directly from the cooling element into, the said, annular flue for discharge into the calcining element for supporting combustion. therein;

In. testimony whereof I have signed my name to this specification. J

ROBERT D. PIKE. 

